Cherry-pick of 5d671a8 onto stable5.

recreate an etag within the scanner if the cache contains an empty etag

Conflicts:
	lib/files/cache/cache.php
	tests/lib/files/cache/scanner.php

2 files changed, 25 insertions, 2 deletions

diff --git a/lib/files/cache/cache.php b/lib/files/cache/cache.php
index 76e1ee97727..cb48ab446be 100644
--- a/lib/files/cache/cache.php
+++ b/lib/files/cache/cache.php
@@ -210,7 +210,6 @@ class Cache {
 			$data['path'] = $file;
 			$data['parent'] = $this->getParentId($file);
 			$data['name'] = basename($file);
-			$data['encrypted'] = isset($data['encrypted']) ? ((int)$data['encrypted']) : 0;
 
 			list($queryParts, $params) = $this->buildParts($data);
 			$queryParts[] = '`storage`';
@@ -272,6 +271,9 @@ class Cache {
 					$params[] = $this->getMimetypeId(substr($value, 0, strpos($value, '/')));
 					$queryParts[] = '`mimepart`';
 					$value = $this->getMimetypeId($value);
+				} elseif ($name === 'encrypted') {
+					// Boolean to integer conversion
+					$value = $value ? 1 : 0;
 				}
 				$params[] = $value;
 				$queryParts[] = '`' . $name . '`';
diff --git a/lib/files/cache/scanner.php b/lib/files/cache/scanner.php
index d99bd6e2ce0..a87d98eb7b8 100644
--- a/lib/files/cache/scanner.php
+++ b/lib/files/cache/scanner.php
@@ -96,13 +96,34 @@ class Scanner extends BasicEmitter {
 				}
 				$newData = $data;
 				if ($reuseExisting and $cacheData = $this->cache->get($file)) {
+					// prevent empty etag
+					$etag = $cacheData['etag'];
+					$propagateETagChange = false;
+					if (empty($etag)) {
+						$etag = $data['etag'];
+						$propagateETagChange = true;
+					}
+
 					// only reuse data if the file hasn't explicitly changed
 					if (isset($data['mtime']) && isset($cacheData['mtime']) && $data['mtime'] === $cacheData['mtime']) {
 						if (($reuseExisting & self::REUSE_SIZE) && ($data['size'] === -1)) {
 							$data['size'] = $cacheData['size'];
 						}
 						if ($reuseExisting & self::REUSE_ETAG) {
-							$data['etag'] = $cacheData['etag'];
+							$data['etag'] = $etag;
+							if ($propagateETagChange) {
+								$parent = $file;
+								while ($parent !== '') {
+									$parent = dirname($parent);
+									if ($parent === '.') {
+										$parent = '';
+									}
+									$parentCacheData = $this->cache->get($parent);
+									$this->cache->update($parentCacheData['fileid'], array(
+										'etag' => $this->storage->getETag($parent),
+									));
+								}
+							}
 						}
 					}
 					// Only update metadata that has changed